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• W2034854968 startingPage "645" @default.
• W2034854968 abstract "BackgroundConcerns have recently been raised regarding the safety of potential human exposure to bisphenol A (BPA), an industrial chemical found in some polycarbonate plastics and epoxy resins. Of particular interest is the exposure of young children to BPA via food stored in BPA-containing packaging.ObjectivesIn this study we assessed the age dependence of the toxicokinetics of BPA and its glucuronidated metabolite, BPA-Glu, using a coupled BPA–BPA-Glu physiologically based toxicokinetic (PBTK) model.MethodsUsing information gathered from toxicokinetic studies in adults, we built a PBTK model. We then scaled the model to children < 2 years of age based on the age dependence of physiologic parameters relevant for absorption, distribution, metabolism, and excretion.ResultsWe estimated the average steady-state BPA plasma concentration in newborns to be 11 times greater than that in adults when given the same weight-normalized dose. Because of the rapid development of the glucuronidation process, this ratio dropped to 2 by 3 months of age. Simulation of typical feeding exposures, as estimated by regulatory authorities, showed a 5-fold greater steady-state BPA plasma concentration in 3- and 6-month-olds compared with adults, reflecting both a reduced capacity for BPA metabolism and a greater weight-normalized BPA exposure. Because of uncertainty in defining the hepatic BPA intrinsic clearance in adults, these values represent preliminary estimates.ConclusionsSimulations of the differential BPA dosimetry between adults and young children point to the need for more sensitive analytical methods for BPA to define, with greater certainty, the adult hepatic BPA intrinsic clearance, as well as a need for external exposure data in young children." @default.
• W2034854968 created "2016-06-24" @default.
• W2034854968 creator A5019411028 @default.
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• W2034854968 date "2009-04-01" @default.
• W2034854968 modified "2023-10-03" @default.
• W2034854968 title "Predicting Plasma Concentrations of Bisphenol A in Children Younger Than 2 Years of Age after Typical Feeding Schedules, using a Physiologically Based Toxicokinetic Model" @default.
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• W2034854968 doi "https://doi.org/10.1289/ehp.0800073" @default.
• W2034854968 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2679611" @default.
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• W2034854968 hasPublicationYear "2009" @default.
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